Mark has decided that the top priority for the company in 2017 is teens, and has asked the Teens Team to coordinate planning and execution of a strategic focus on teens in H1. The key points in the deck are: Geographically, our current FBF teen usage segments by RoW (great) EU (good) US (bad). Our overall goal for the strategic focus is total teen time spent. We have two big 'build' opportunities: Under-13s, including regulated Under-13s; and Social entertainment and video. We have two big 'fix' opportunities: Facebook for global teens; and Instagram for U.S. teens, esp. Direct and Stories. Participating teams will take a specific goal for teens. Our overall company goal is total teen time spent. The Teens Team has a pool of headcount to allocate to partner teams who take on goals. We're heavily investing in improving our ability to model actual age of teens, which we expect to ship as an operational deltoid/dashboard facet in H1. We have an enormous Understand effort underway, with more than 12 data scientists and researchers doing comprehensive product and market analysis for teens.